so today I loaded the Modular Building System (from the Marketplace) into my project and then I dragged and dropped into a subfolder. Everything worked fine EXCEPT moving the Demo_Scene. When I try moving the Demo_Scene to the subfolder it causes UE4 to break with a big memory leak lol. It uses 7GB of my available 8GB.
Edit: I used version 4.7.0
Yeah, there is a problem when moving scenes imported from packages. It’s been around for quite some time.
The exact same problem occurs also when I copy and paste elements in the UMG editor, although it rarely happens.
Edit: And now it happens also when deleting stuff. The Content Browser seems a bit broken ^^
Please post this to the answerhub in the bug reports section at http://answers.unrealengine.com so we can assist you in depth. Thank you!